tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
6 *
7 * Copyrights for code taken from ext2:
8 * Copyright (C) 1992, 1993, 1994, 1995
9 * Remy Card (card@masi.ibp.fr)
10 * Laboratoire MASI - Institut Blaise Pascal
11 * Universite Pierre et Marie Curie (Paris VI)
12 * from
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * This file is part of exofs.
17 *
18 * exofs is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation. Since it is based on ext2, and the only
21 * valid version of GPL for the Linux kernel is version 2, the only valid
22 * version of GPL for exofs is version 2.
23 *
24 * exofs is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with exofs; if not, write to the Free Software
31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32 */
33#ifndef __EXOFS_H__
34#define __EXOFS_H__
35
36#include <linux/fs.h>
37#include <linux/time.h>
38#include <linux/backing-dev.h>
39#include "common.h"
40
41/* FIXME: Remove once pnfs hits mainline
42 * #include <linux/exportfs/pnfs_osd_xdr.h>
43 */
44#include "pnfs.h"
45
46#define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
47
48#ifdef CONFIG_EXOFS_DEBUG
49#define EXOFS_DBGMSG(fmt, a...) \
50 printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
51#else
52#define EXOFS_DBGMSG(fmt, a...) \
53 do { if (0) printk(fmt, ##a); } while (0)
54#endif
55
56/* u64 has problems with printk this will cast it to unsigned long long */
57#define _LLU(x) (unsigned long long)(x)
58
59struct exofs_layout {
60 osd_id s_pid; /* partition ID of file system*/
61
62 /* Our way of looking at the data_map */
63 unsigned stripe_unit;
64 unsigned mirrors_p1;
65
66 unsigned group_width;
67 u64 group_depth;
68 unsigned group_count;
69
70 enum exofs_inode_layout_gen_functions lay_func;
71
72 unsigned s_numdevs; /* Num of devices in array */
73 struct osd_dev *s_ods[0]; /* Variable length */
74};
75
76/*
77 * our extension to the in-memory superblock
78 */
79struct exofs_sb_info {
80 struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/
81 int s_timeout; /* timeout for OSD operations */
82 uint64_t s_nextid; /* highest object ID used */
83 uint32_t s_numfiles; /* number of files on fs */
84 spinlock_t s_next_gen_lock; /* spinlock for gen # update */
85 u32 s_next_generation; /* next gen # to use */
86 atomic_t s_curr_pending; /* number of pending commands */
87 uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */
88 struct backing_dev_info bdi; /* register our bdi with VFS */
89
90 struct pnfs_osd_data_map data_map; /* Default raid to use
91 * FIXME: Needed ?
92 */
93/* struct exofs_layout dir_layout;*/ /* Default dir layout */
94 struct exofs_layout layout; /* Default files layout,
95 * contains the variable osd_dev
96 * array. Keep last */
97 struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
98};
99
100/*
101 * our extension to the in-memory inode
102 */
103struct exofs_i_info {
104 struct inode vfs_inode; /* normal in-memory inode */
105 wait_queue_head_t i_wq; /* wait queue for inode */
106 unsigned long i_flags; /* various atomic flags */
107 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
108 uint32_t i_dir_start_lookup; /* which page to start lookup */
109 uint64_t i_commit_size; /* the object's written length */
110 uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
111};
112
113static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
114{
115 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
116}
117
118struct exofs_io_state;
119typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);
120
121struct exofs_io_state {
122 struct kref kref;
123
124 void *private;
125 exofs_io_done_fn done;
126
127 struct exofs_layout *layout;
128 struct osd_obj_id obj;
129 u8 *cred;
130
131 /* Global read/write IO*/
132 loff_t offset;
133 unsigned long length;
134 void *kern_buff;
135
136 struct page **pages;
137 unsigned nr_pages;
138 unsigned pgbase;
139 unsigned pages_consumed;
140
141 /* Attributes */
142 unsigned in_attr_len;
143 struct osd_attr *in_attr;
144 unsigned out_attr_len;
145 struct osd_attr *out_attr;
146
147 /* Variable array of size numdevs */
148 unsigned numdevs;
149 struct exofs_per_dev_state {
150 struct osd_request *or;
151 struct bio *bio;
152 loff_t offset;
153 unsigned length;
154 unsigned dev;
155 } per_dev[];
156};
157
158static inline unsigned exofs_io_state_size(unsigned numdevs)
159{
160 return sizeof(struct exofs_io_state) +
161 sizeof(struct exofs_per_dev_state) * numdevs;
162}
163
164/*
165 * our inode flags
166 */
167#define OBJ_2BCREATED 0 /* object will be created soon*/
168#define OBJ_CREATED 1 /* object has been created on the osd*/
169
170static inline int obj_2bcreated(struct exofs_i_info *oi)
171{
172 return test_bit(OBJ_2BCREATED, &oi->i_flags);
173}
174
175static inline void set_obj_2bcreated(struct exofs_i_info *oi)
176{
177 set_bit(OBJ_2BCREATED, &oi->i_flags);
178}
179
180static inline int obj_created(struct exofs_i_info *oi)
181{
182 return test_bit(OBJ_CREATED, &oi->i_flags);
183}
184
185static inline void set_obj_created(struct exofs_i_info *oi)
186{
187 set_bit(OBJ_CREATED, &oi->i_flags);
188}
189
190int __exofs_wait_obj_created(struct exofs_i_info *oi);
191static inline int wait_obj_created(struct exofs_i_info *oi)
192{
193 if (likely(obj_created(oi)))
194 return 0;
195
196 return __exofs_wait_obj_created(oi);
197}
198
199/*
200 * get to our inode from the vfs inode
201 */
202static inline struct exofs_i_info *exofs_i(struct inode *inode)
203{
204 return container_of(inode, struct exofs_i_info, vfs_inode);
205}
206
207/*
208 * Given a layout, object_number and stripe_index return the associated global
209 * dev_index
210 */
211unsigned exofs_layout_od_id(struct exofs_layout *layout,
212 osd_id obj_no, unsigned layout_index);
213/*
214 * Maximum count of links to a file
215 */
216#define EXOFS_LINK_MAX 32000
217
218/*************************
219 * function declarations *
220 *************************/
221
222/* ios.c */
223void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
224 const struct osd_obj_id *obj);
225int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
226 u64 offset, void *p, unsigned length);
227
228int exofs_get_io_state(struct exofs_layout *layout,
229 struct exofs_io_state **ios);
230void exofs_put_io_state(struct exofs_io_state *ios);
231
232int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
233
234int exofs_sbi_create(struct exofs_io_state *ios);
235int exofs_sbi_remove(struct exofs_io_state *ios);
236int exofs_sbi_write(struct exofs_io_state *ios);
237int exofs_sbi_read(struct exofs_io_state *ios);
238
239int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
240
241int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
242static inline int exofs_oi_write(struct exofs_i_info *oi,
243 struct exofs_io_state *ios)
244{
245 ios->obj.id = exofs_oi_objno(oi);
246 ios->cred = oi->i_cred;
247 return exofs_sbi_write(ios);
248}
249
250static inline int exofs_oi_read(struct exofs_i_info *oi,
251 struct exofs_io_state *ios)
252{
253 ios->obj.id = exofs_oi_objno(oi);
254 ios->cred = oi->i_cred;
255 return exofs_sbi_read(ios);
256}
257
258/* inode.c */
259unsigned exofs_max_io_pages(struct exofs_layout *layout,
260 unsigned expected_pages);
261int exofs_setattr(struct dentry *, struct iattr *);
262int exofs_write_begin(struct file *file, struct address_space *mapping,
263 loff_t pos, unsigned len, unsigned flags,
264 struct page **pagep, void **fsdata);
265extern struct inode *exofs_iget(struct super_block *, unsigned long);
266struct inode *exofs_new_inode(struct inode *, int);
267extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
268extern void exofs_evict_inode(struct inode *);
269
270/* dir.c: */
271int exofs_add_link(struct dentry *, struct inode *);
272ino_t exofs_inode_by_name(struct inode *, struct dentry *);
273int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
274int exofs_make_empty(struct inode *, struct inode *);
275struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
276 struct page **);
277int exofs_empty_dir(struct inode *);
278struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
279ino_t exofs_parent_ino(struct dentry *child);
280int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
281 struct inode *);
282
283/* super.c */
284int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
285
286/*********************
287 * operation vectors *
288 *********************/
289/* dir.c: */
290extern const struct file_operations exofs_dir_operations;
291
292/* file.c */
293extern const struct inode_operations exofs_file_inode_operations;
294extern const struct file_operations exofs_file_operations;
295
296/* inode.c */
297extern const struct address_space_operations exofs_aops;
298extern const struct osd_attr g_attr_logical_length;
299
300/* namei.c */
301extern const struct inode_operations exofs_dir_inode_operations;
302extern const struct inode_operations exofs_special_inode_operations;
303
304/* symlink.c */
305extern const struct inode_operations exofs_symlink_inode_operations;
306extern const struct inode_operations exofs_fast_symlink_inode_operations;
307
308#endif